Fuel-economizer



J. F. KENDALL.

FUEL ECONOMIZER. APPLICATION FILED OCT. 10. 19w.

1,333,11 6. I Patented Mai. 9,1920.

- 2g INVENTOR 2y pfl MM,

I A ORNEY.

UNITED STATES PATENT oFFroE.

JOHN F. KENDALL, OF BROOKLYN, NEW YORK.

rUE'L-nconoMIzER.

To all whom z'tmay concern:

Be it known that I, J OHN F. KENDALL, a citizen of the United States of America, residing at Flatbush, county of Kings, Brooklyn, State of New York, have invented certain new and useful Improvements in Fuel-Economizers, ofwhich the following is a specification-i i This invention relates'to fuel economizers.

An object of the invention is to provide a fuel economizer constructed to be applied to or installed in operative relation to a furnace, boiler, steam or other plant utiliz-' ing the combustion of fuel, by least modification or alteration of the parts of such fuel combustion apparatus, but thereby attaining an improved efficiency in the utilized heat units derived from the fuel. I l A further object of the invention is the provision of means for more effectually sup plymg the required amount of air commensurately'with variations of the combustion of the fuehas the fuel combustion ap 'paratus is varied in operatlon as desired.

'rectly to the exterior of the flue pipe, such casing having; an inlet for the-inflow of air from the atmosphere, and compartments provi'ding a circuitous or angular path of the inflowing air and constructed and ar ranged to 'pre-heatlthe inflowmg' air and regul'ate the volume of the, pre-heated air in quantity commensurate with the degree of intensity of the combustion of thefuel.

enlarged scale; and

Further objects and features of the invention will be more fully understood from,

the following detail description and the accompanying drawings, in which Figure-1 indicates in vertical elevation a coal furnace provided with one form of my fuel economizer, the latter being shown in vertical, central section; r

Fig. 2 is a cross section of my fuel economizer on line 2-2 of Fig. 1, on a somewhat Fig, 3 is a perspective view of my fuel economizer as viewed from above, with the left-hand side wall omitted to more-clearly show the constructionof'the inner parts.

Referring to-the drawings, 1 indicates any a-pproved type of coal furnace, having the a Communication Specification of Letters Patent. Patented lflar. 9, 1920.

Application filed October 19, 1918. Serial'lqo. 257,630.

flue pipe v2 extending I from the outlet box 3' of thefurnace l to-the intake 4 f the other fuel combustionapparatus, is determined from the particular characteristics of such furnace, or. other fuel combustion apparatus, as will appear. i

The" fuel economizer 6 comprises generally the casing 7 having the bottom wallS and opposite side walls 9, 10. The air intake 11 is-preferably formed in'an end wall 12 secured to the bottom 8 and provided with the intake openin 's 11. 5 The upper portion of the casing 7 is preferably more or less open, for the purpose. as appears more fully'hereinafter. i V

The curved flanges 13, 14, respectively secured to the'side vwalls 9, 10' areprovided for attaching the casing 7 of the fuel economizer in seal-mg relation to an exterior face ofthe flue pipe 2. The end wall 12 may be similarly provided with the attachment curved flange 15 4 between the interior of the fuel economizer G'and the interior of the flue pipe had by means-of the a r;

discharge opening 1 5 which may be either cut in a previously installed flue pipe or" provided for in a section of a flue pipe to, replace a section or to form a partof the resulting flue pipe. 7

Intermediate the air discharge opening.

15 of the fuel economizer' 6 and the air inlet 11, arearranged compartments affording passage of the air and controlling the flow of air commensurately with e eflt'ec.

tive'teniperature of combustion, and accord ingly commensurate with the extent of evolution'ofcombustible gases in the. region of combustion. s In the; part cular one end with the air intakell' and at the opposite end withthe first or lowest temperature compartment 17 'ofrelatively-re- V .duce d' vertical height and consequent relatively small volume. 1 Such compartment -1=7 in turn communicates with the second or volume, which compartment 18 in turn secured to the bottom wall 8" The wall '1 ay also be provided with the flange ume.

communicates with the final or highest temperature compartment 19 of relatively greatest vertical height and greatest vol- Said compartment 19 is open at its top to thereby afford effective heating relation with the flue pipe when the fuel econoinizer is installed in position. Such arrangement of asset of serially related compartments of relatively increasing volume in the direction of lion-1 of the air theretliro'ugh and gradually increasing temperature in heatingrelation to the flue pipe, is attained in the construction shown by the provision of the partition or wall 21 extending for its major portion substantially parallel to the bottom wall .8, a similar partition or wall 22 disposed in spaced relation to said partition or wall 21 but having the curved portion 23 extending in spaced relation to the end of saidpartition or wall 21 and downwardly to the bottom wall 8, to

thereby form the passage 24: from the compartment 17 to the compartment lS The compartment 19 is provided with the regulating discharge openings 2 in the discharge wall 25, preferably positioned at an angle with respect to the plane or region of opening of the discharge opening 15 of the fuel econoinizer 6, thereby providing for the compartment, or pocket 26 located between the discharge openings 2% of the compartment ltl'and the discharge opening 15 of thefuel economizer 6, The proper volume of su h compartment or pocket 26 is determinable by means of the more or less inclined wall 2? located between the bottom 8 of the fuel economizer 6 and the wall 28 28 29 adapted to be secured to the flue pipe 2. Within the compartments 1?, 18, l may provide loatlles 30, 81, 82, respectively extending transversely to the pathv of flow of the air therethrough and preferably positioned alternately on the bottom and top walls of the respcct1ve lndividual compartments.

The fuel economizer is applied to such portion of the flue pipe as to effect the location of the discharge opening 15 of the fuel economizer at a point traversed by the back draft indicated by the arrows 34, whereby the preheated air supplied by the fuel econoinizer is directed into the back draft and thus eventually within the region of combustion of the furnace gases. lt'will' be understood thatthe discharge opening 15 is of the properextent of opening for the flow of fthe preheated air to provide together with the back draft "the proper amount of oxvaenof increased temperature available iwithin the region of combustion ofthe fuel for direct chemical combination with the carbon monoXid and other partially oxygenated carbon and other combustible gases evolved upon combustion of coal or other fuel. 1

My fuel. economizer is also applicable for use with a flue pipe or passage provided with draft regulating means having the construction set forth in my copending application Serial No. 257,628, filed by me the 10th day of October, 1918, entitled Draft regulating meansyand operating to reflect and return the back draft, through the chimney or stack, and also to separate out and return the partially oxygenated carbonaceous and other combustible ,gasesto the region of combustion. In such use of my fuel economizer, the air supplied to the in terior of the flue pipe or passage and thence to the region of combustion, is furnished wholly by tl e fuel economizer.

In similar manner, my fuel economizer is pplicablefor use with hotwater furnaces, steam and other industrial plants of whatsoever nature utilizing the heat energy evolved upon the combustion of solid or liquid or gaseous fuel.

lVherea-s l viave described my] invention by reference to specific'for :is thereof, it will be understood that many changesand modilications may be made without departing from the spirit of the invention, as defined by the appended claims. 1 I claim.

1. The combination with v a fuel combu tion apparatus provided with a flue for the discharge of the products of con'bustion, said fluebeing provided wlth an opening located in a certain portion ofthe lateral. wall thereof, said certain portion extending. not

greater than one-half of the perimeter of the said lateral wall of a fuel economize]: comprising a casing provided with an open side adapted to communicate with'said open ing in said lateral wall, said casing being constructed to be applied as a unitary single relation with said flue and means for attaching said casing as a singleunit to said certain portion of said fine. 7

A casing for a fuel combustion .apparatus provided'with a fiue'forthe dis charge of the products of combustion, said flue being provided with-an opening extending through a certain portion of the lGO lateral wall of the llue,'said portion extending not greater than one half of the perimeter of said lateral wall, said casing being provided with an open side adapted to communicate with said opening, said casing comprising bottom, side and end walls rigidly connected toone another, a partition forming in conjunction with said walls of said casing a passage for the flow of air therethrough, a portion of said passage ere tending in its direction oflength substantially parallel to the passage of said fine and in heating relation with said flue, said casing being provided with an inlet for the admission of air into said passage and means for attaching saidcasing as a single unit to said certain portion of said flue.

3. The combination with a fuel combus tion apparatus provided with a circular flue for the discharge or the products of combustion, said flue being provided with an opening extending through a certain portion of the circular wallof said flue, said certain portion extending not greater than one half of the circumference of said wall, of a fuel economizer comprising a casing having an open side adapted to communicate with said opening, said casing comprising bottom, side andend walls connected rigidly to one another and provided with an inlet for the admission of air from the atmos phere, )artitions disposed within said oas-i said flue being, provided with an opening in a certain'portion ofits lateral wall, of a fuel economizer comprlsing a casing havmg an open side adapted to communicate with the interior of said flue, saidcasing comprising bottom, side and end walls, said casing being provided with an inlet for the admission of air from the atmosphere, a plurality of spaced partitions disposed interiorly of said casing and forming in coriunction with said walls of said casing an anterior passage of relatively small capacity communicating with said inlet of said casing and a posterior passage of relatively large capacity, said second-named passage communicating with said first-named passage and means for attaching said fuel economizer to said flue.

5. The combination with a fuelcombus. tion apparatus provided with a flue for the discharge of the products of combustion, said flue being provided'with an opening in a lateral wall, of a fuel economizer comprising a casing having an open side adapted to communicate with the interior ofsaid flue, said casing comprising bottom, side and end .walls fixedly connected to one another, said casing being provided with an inlet for the admission of air from the atmosphere, partitions disposed interiorly of said casing and forming in conjunction with said walls of said casing a passage of relatively small'capacity and a passage of relatively large capacity, said second-named passage communicating serially with said first-named passage and meansfor attaching saidfuel economizer as a singlelunit to said the 6. A fuel economizer adapted to be posi tioned exteriorly to a certain portion not serially communicating with one another and with said inlet for the passage of air therethrough, said compartments increasing in capacity in the direction of flow of the air through said compartments.

7. A fuel economizer adapted to be positioned to a certain portion of a flue constructed for the discharge of products, of combustion, said certain portion being not greater than one-half of the perimeter of said line, said fuel .economizer comprising bottom, side and end walls, said casingbeing'provided with an opening for the flow of air therethrough, a plurality of partition's spaced from one another and forming in conjunction with said walls of said casing a plurality of serially communicating compartments extending in different direc tions for the passage of air therethrough, 110

said compartments increasing in capacity in the direction of flow of the air, and 'means disposed in said compartments for retarding the flow of air therethrough.

In testimony whereof I have signed this specification this 5th day of October, 1918.

1 JOHN F. KENDALL. 

